动态添加组框控件时，Flow Layout Panel出现问题

Question

我有一个组框控件列表，我需要在流程布局面板中只显示几个问题，但它没有正确显示（宽度和高度减少）但是如果我将该控件添加到表单中它正确显示 这是我的代码。请帮助我如何摆脱这个问题

流程布局面板代码（displyQues）

private void getQuestions(int quesid)
{
        int j = 1;
        for (int i = quesid; i <= lstgrpques.Count; i++)
        {
            displyQues.Location = new Point(15, 30);
            displyQues.Show();
            displyQues.Size = new System.Drawing.Size(1218, 620);
            displyQues.AutoScroll = true;
            lstgrpques[i - 1].Show();
            displyQues.WrapContents = false;
            displyQues.Controls.Add(lstgrpques[i - 1]);
            displyQues.FlowDirection = FlowDirection.TopDown;
            qstnId++;
            j++;
            if (j == 5)
            {
                break;
            }

        }

    }

组框代码

 foreach (var question in questions)
 {
   int QustTxtHght = 0;
   GroupBox QuesAnsoptn = new GroupBox();
   QuesAnsoptn.Hide();
   QuesAnsoptn.AutoSize = true;
   QuesAnsoptn.Width = 820;
   QuesAnsoptn.Location = new Point(15, QustHgt);
   var quest = question.Attribute("ques").Value.Trim();
   if (quest.Contains('{'))
   {
   quest = GetFormatCode(quest);
   QustTxtHght = quest.Length +40;
   }
   else
    QustTxtHght = 15;

   QuesAnsoptn.Text = question.Attribute("id").Value + ". " + quest;
   QuesAnsoptn.Font = new Font("Microsoft Sans Serif", 10);

   var options = question.Descendants("option");
   var optHgt = 0;
   foreach (var option in options)
   {
    RadioButton rdbtn = new RadioButton();
    rdbtn.AutoSize = true;
    rdbtn.Location = new Point(20, QustTxtHght + optHgt + 10);
    rdbtn.Name = k.ToString();
    lstRdOptns.Add(rdbtn);
    rdbtn.Font = new Font("Microsoft Sans Serif", 10);
    var opt = option.Value;
    var loc = 0;
    if (opt.Contains('{'))
     {
       opt = GetFormatCode(opt);
       loc = opt.Length + 40;
     }
    else { loc = rdbtn.Size.Height; }
    rdbtn.Text = opt;
    optHgt = loc + optHgt;
    QuesAnsoptn.Controls.Add(rdbtn);
    }
    k++;
    this.Controls.Add(QuesAnsoptn);
    QustHgt = QuesAnsoptn.Size.Height + QustHgt + 20;
    QuesAnsoptn.Size = new System.Drawing.Size(820,QuesAnsoptn.Size.Height);
    lstgrpques.Add(QuesAnsoptn);
  }